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A108896
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Numbers such that the outer 2 digits are 9 and the inner digits are 4.
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0
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949, 9449, 94449, 944449, 9444449, 94444449, 944444449, 9444444449, 94444444449, 944444444449, 9444444444449, 94444444444449, 944444444444449, 9444444444444449, 94444444444444449, 944444444444444449
(list;
graph;
refs;
listen;
history;
text;
internal format)
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OFFSET
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1,1
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COMMENTS
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These numbers are all composite.
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LINKS
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Table of n, a(n) for n=1..16.
Cino Hilliard, Proof 94..49
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FORMULA
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S(x)=9*10^(x+1)+ 9 + 40*(10^x-1)/9.
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PROG
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(PARI) S(n, r, m)=for(x=1, n, y=m*10^(x+1)+m+r*10*(10^x-1)/9; print1(y", "))
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CROSSREFS
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Sequence in context: A020366 A217936 A013532 * A096954 A048267 A073500
Adjacent sequences: A108893 A108894 A108895 * A108897 A108898 A108899
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KEYWORD
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easy,nonn,base
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AUTHOR
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Cino Hilliard (hillcino368(AT)gmail.com), Jul 16 2005
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STATUS
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approved
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